Well, you know, I like people in general. So I just...try to help people, you know? I guess that's my passion. [He brightens up a little] A-And parties. I kinda became a bit of a host of them, and most of the time they turn out pretty well!

[Among the many sad sack things in his profile, 'hosting parties' really is one of the skills listed, and from the sounds of it, it's one of the few things Filbo actually feels confident about.

After a pause, he confesses because, hey, Kuranosuke said a nice reason for his own passion, so...may as well confess his own]

...I kinda began doing them because I have--ah, had this friend who turned into an adventurer. She was...pretty much the only person outside immediate family who, well...kinda treated me like someone with feelings. Like the sister I never had. So she went into the adventuring life and from time to time she would come back to town, and I just--I tried my best to make her welcome every time. And what better way to do that than to celebrate, you know?

[He sounds absolutely adoring. For Lizbert there was nothing Filbo wouldn't have done. Even drop everything else in his life when she was all 'yo filbo want to come in my crew to this distant island with rumors of doom and horror']